Physical fields described by maxwell's equations

Fields that satisfy Maxwell's equations of motion are analyzed. Investigation carried out in this work, shows that the free electromagnetic field, spinor Dirac's field without mass, spinor Dirac's field with mass, and some other fields are described by the same variational formulation. The conditions that a field be described by Maxwell's equations of motion are given in this work, and some solutions of these conditions are also given. The question arises, which physical objects are formulated by the same or analogous equations of physics.